Steam is a digital distribution service owned by Valve. Originally created to distribute its own games, Steam has since expanded to become the de facto standard for digital distribution of PC games, and supports community features, downloadable content and achievements. Starting 2010, Steam now offers Mac games as well.

Tried repairing, reinstalling and restarting, deleting and renaming the .exe files as recommended here - http://forums.steamgames.com/forums/showthread.php?p=23925188, I'm the one and only person on this PC, I have full admin rights, I have up to date anti-virus and anti-malware software, nothing has changed on the software side of things from yesterday. What the shitting balls is going on? I was playing Just Cause 2 about 24 hours ago...JUST fine...

JUST CAUSE...

JUST...just...2

--- --- ---

If I do this: "First delete the files in the steam folder EXCEPT the folders and steam.exe"

I get this: Steam.exe (main exception): ERROR: copying SteamNew.exe to Steam.exe failed, Win32 Error 32 "The process cannot access the file because it is being used by another process."